Homestake Mining Company

NPDES permit CO0022756 · Minor NON-POTW · administratively continued, expires 2014-12-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2014-12-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
1of 19 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (27)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 20 mg/L all year
001Solids, total suspendedDAILY MX <= 30 mg/L all year
001Zinc, potentially dissolved30DA AVG <= 500 ug/L all year
001Zinc, potentially dissolvedDAILY MX <= 1000 ug/L all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Radium 226, dissolved30DA AVG <= 3 pCi/L all year
001Radium 226, dissolvedDAILY MX <= 10 pCi/L all year
001Radium 226 + radium 228, total30DA AVG report only all year
001Radium 226 + radium 228, totalDAILY MX report only all year
001Uranium, total30DA AVG <= 2000 ug/L all year
001Uranium, totalDAILY MX <= 4000 ug/L all year
001Flow, in conduit or thru treatment plant30DA AVG <= 2.6 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Toxicity [chronic], Ceriodaphnia dubiaSINGSAMP report only all year
001Toxicity [chronic], Ceriodaphnia dubiaMN VALUE report only all year
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]SINGSAMP report only all year
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]MN VALUE report only all year
001Solids, total dissolvedQRTR AVG report only all year
001Oil and grease visualINST MAX report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 100 % all year
001%Effect Static Renewal 7Day Chronic Pimephales promelasSINGSAMP report only all year
001%Effect Static Renewal 7Day Chronic Pimephales promelasMN VALUE report only all year
001%Effect Static Renewal 7Day Chronic Pimephales promelasMN VALUE >= 100 % all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states